The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2018:3590 advisory.

    The kernel packages contain the Linux kernel, the core of any Linux operating system.

    Security Fix(es):

    * A flaw named FragmentSmack was found in the way the Linux kernel handled reassembly of fragmented IPv4     and IPv6 packets. A remote attacker could use this flaw to trigger time and calculation expensive fragment     reassembly algorithm by sending specially crafted packets which could lead to a CPU saturation and hence a     denial of service on the system. (CVE-2018-5391)

    * kernel: out-of-bounds access in the show_timer function in kernel/time/posix-timers.c (CVE-2017-18344)

    * kernel: mm: use-after-free in do_get_mempolicy function allows local DoS or other unspecified impact     (CVE-2018-10675)

    * kernel: Integer overflow in Linux's create_elf_tables function (CVE-2018-14634)

    For more details about the security issue(s), including the impact, a CVSS score, and other related     information, refer to the CVE page(s) listed in the References section.

    Red Hat would like to thank Juha-Matti Tilli (Aalto University - Department of Communications and     Networking and Nokia Bell Labs) for reporting CVE-2018-5391 and Qualys Research Labs for reporting     CVE-2018-14634.

    Bug Fix(es):

    * Previously, a kernel panic occurred when the kernel tried to make an out of bound access to the array     that describes the L1 Terminal Fault (L1TF) mitigation state on systems without Extended Page Tables (EPT)     support. This update extends the array of mitigation states to cover all the states, which effectively     prevents out of bound array access. Also, this update enables rejecting invalid, irrelevant values, that     might be erroneously provided by the userspace. As a result, the kernel no longer panics in the described     scenario. (BZ#1629565)

    * Previously, a packet was missing the User Datagram Protocol (UDP) payload checksum during a full     checksum computation, if the hardware checksum was not applied. As a consequence, a packet with an     incorrect checksum was dropped by a peer. With this update, the kernel includes the UDP payload checksum     during the full checksum computation. As a result, the checksum is computed correctly and the packet can     be received by the peer. (BZ#1635792)

    * Previously, a transform lookup through the xfrm framework could be performed on an already transformed     destination cache entry (dst_entry). When using User Datagram Protocol (UDP) over IPv6 with a connected     socket in conjunction with Internet Protocol Security (IPsec) in Encapsulating Security Payload (ESP)     transport mode. As a consequence, invalid IPv6 fragments transmitted from the host or the kernel     occasionally terminated unexpectedly due to a socket buffer (SKB) underrun. With this update, the xfrm     lookup on an already transformed dst_entry is not possible. As a result, using UDP iperf utility over IPv6     ESP no longer causes invalid IPv6 fragment transmissions or a kernel panic. (BZ#1639586)

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Detections

Analytics

RHEL 7 : kernel (RHSA-2018:3590)

high Nessus Plugin ID 118947

Version 1.13

Version 1.12

Version 1.13 Nov 5, 2024, 12:50 PM CVSS metrics ("Cvssv4 score" set to 0.0) CVSSv2 severity (based on None, severity decreased from "High" to "Low") Plugin metadata Plugin Feed: 202411051250
Version 1.12 Apr 28, 2024, 3:17 AM Detection (updated detection logic) Plugin metadata Reference Plugin Feed: 202404280317